1. Have you switched the light off?
2. Come on, you need a rest. You have been studying for five hours non-stop.
3. My hands are dirty because I have been fixing the car.
4. Did you hear about Jacob? He has broken his leg.
5. My friend Charlie has been studying in Cambridge all summer, but next week he's coming home.
6. They have been building more and more shopping centres in the city for a while now and I don't think they're going to stop.
7. That group has made more than ten CDs.
8. I'm very sorry. Have you been waiting long?
9. My legs are tired because I have been walking all day.
10. That's it! We have finished this exercise.
